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Some of these can be found over-the-counter, and those with more substantial GHK-Cu concentrations may require a prescription under medical supervision, typically in cases of more severe or complex skin injuries
Some pharmacies offered additional strengths, but these three represented the core product line for most providers
Advances in Protein Chemistry and Structural Biology: Metal-containing Enzymes
Stopping before 8 weeks produces minimal sustained pigmentation because melanogenesis had not reached equilibrium
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